Tri-fold briefcase



FIG. 1 is a perspective view of an embodiment of a tri-fold briefcase, showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof.

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof;

FIG. 8 is a perspective view thereof, in an open configuration;

FIG. 9 is a perspective view thereof, in another open configuration; and,

FIG. 10 is a rear perspective view thereof, in another open configuration.

Broken lines are for illustrating unclaimed portions of the tri-fold briefcase; the broken lines form no part of the claimed design. FIGS. 1 and 8-10 are shown at a smaller scale than the remaining views. 

CLAIM I claim the ornamental design for a tri-fold briefcase, as shown and described. 